Five apples enter an SVG bowl. D3's general update pattern joins circles to `fruits` data, using `selectAll`, `enter`, `merge`, and `exit`. Initial circles have zero radius, then a 1000ms `transition` animates them to their target positions and sizes. A timed script pops apples, swaps one for a lemon (changing its color via `scaleOrdinal` and radius), and filters out another, demonstrating enter, update, and exit transitions.